TABLE 2.

**TABLE 2.** Comparative features and morphology of the genera *Lutophila, Biremis, Oestrupia, Krasskella, Chamaepinnularia,* and *Nupela* .
Character	Lutophila	Biremis 1,2	Oestrupia 1,3	Krasskella 4	Chamaepinnularia 5,6	Nupela 7,8
......continued on the next page
¹ Witkowski et al. 2000, ² Edlund et al. 2001, ³ ANSP 2023, ⁴ Bishop & Spaulding 2014, ⁵ Spaulding & Edlund 2009, ⁶ Hofmann et al. 2011, ⁷ Vyverman & Compère 1991, ⁸ Potapova et al. 2003
Valve size	Small (L:8.4–	Small to	Medium to	Small (L:12–27,	Small (L:5–34, W:2–	Small (L:5–29,
	25.2, W:1.6–3.7	medium (L:7–	large (L:50–	W:1.4–3 µm)	12 µm)	W:2–6 µm)
	µm)	78, W:2.5–10	110, W:6.5–15
		µm)	µm)
Valve	Bilateral	Dorsi-ventral or	Bilateral	Bilateral	Bilateral	Slightly
symmetry	or slightly	bilateral				asymmetric,
	asymmetric					heterovalvar
Valve shape	Linear	Elliptical or	Linear or	Linear lanceolate	Linear lanceolate,	Linear
	lanceolate	linear lanceolate	broadly		elliptical, rhombical-	lanceolate
			lanceolate		lanceolate or undulate
Apex	Broadly round	Cuneate, rostrate	Broadly round	Subcapitate or	Subcapitate, capitate	Subcapitate,
	to subcapitate	or subrostrate	or slightly	capitate	or broadly round	capitate or
			cuneate			slightly cuneate
Striae	Not chambered,	İncludes two	Chambered	Not chambered,	Chambered,	Not chambered,
	composed of	kinds of areolae,	with two	composed of two	composed of two	composed
	two rows of	one in valve	alveoli	rows of areolae,	rows of macroareolae,	of elliptic
	macro areolae,	face with broad	composed of	one macroareola	one on valve face	areolae, Areolae
	one on valve	areolae, not	macroareolae	on valve face and	and one on mantle,	transapically
	face and one on	chambered	occluded	one circular on	sometimes circular	elongated,
	mantle	and the other	by small	mantle		external
		marginally	multiseriate			openings of
		chambered	poroids, one			areolae larger
		Composed	on valve face			than internal
		of two,	and the other			openings
		three or four	extending onto
		transapically	the mantle
		circle or slit-like
		broad openings
		on mantle
Occlusion in	Hymenate	Absent	Absent	Hymenate with	Covered by vela	Hymenate
external valve				lineolate pores
face
Occlusion in	Foriculate	Present (delicate	Absent	Absent	Absent	?
internal valve		porous strip,
face		called cribra)
Internal	Straight or	Simple and	Arcuate or bent	Slightly bent to	slightly bent to one	Straight or T-
central raphe	slightly bent to	straight	to one side	one side	side or strongly	shaped ends
endings	one side				deflected
Internal polar	Simple and	Bent to one side	Deflected to	Simple and	Simple and straight	Simple and
raphe endings	straight	or straight	one side	straight		straight
External central raphe endings	Straight and slightly expanded	Slightly expanded or simple, indistinct	Simple and straight or slightly expanded and slightly bent to one side	Straight	Straight or slightly bent to one side, expanded with small distinct pores	Slightly expanded or straight
External polar raphe endings	Deflected to the same side	Deflected to the same side or straight	Simple and straight or deflected to one side	Deflected to the same side	Deflected to the same side	Deflected to the same side
Helictoglossa	Shallow and present at ends	Shallow and present at ends	Present at ends	Very small and present at ends	Small and present at ends	Shallow and present at ends
Girdle bands	Simple	Porous	Simple	Simple	Simple	?
Habitat	Hypersaline	Freshwater-marine	Marine-brackish	Freshwater	Freshwater or marine	Freshwater
Raphe	Central, externally straight and internally slightly curved	Central or eccentric, straight or biarcuate	Central, straight	Central, slightly curved and short not reaching the center	Central, internally straight or slightly curved, externally straight or slightly arched	Central, slightly curved, heterovalvar (may be reduced or absent on one valve)
Hyaline longitudinal lines or areas	Absent	As a line near the valve margin interrupting the stria and forming a marginal chamber	As a line near the valve margin separating the two alveoli	Absent	As a line near the margin of the valve or as areas (only C. witkowskii ), in some species absent	Absent
Central area	Indistinct and small	Indistinct or forming a fascia	Forming a fascia or round, sometimes extended to one side with irregular thickenings	Linear	Swollen or undulate with a fascia or indistinct and small	Asymmetric to apical axis
Axial area	Narrow	Broad, in some species forming a conopeum	Broad	Narrow	Narrow or rather broad	Linear to lanceolate

TABLE 2. Comparative features and morphology of the genera Lutophila, Biremis, Oestrupia, Krasskella, Chamaepinnularia, and Nupela .

Character

Lutophila

Biremis 1,2

Oestrupia 1,3

Krasskella 4

Chamaepinnularia 5,6

Nupela 7,8

......continued on the next page

¹ Witkowski et al. 2000, ² Edlund et al. 2001, ³ ANSP 2023, ⁴ Bishop & Spaulding 2014, ⁵ Spaulding & Edlund 2009, ⁶ Hofmann et al. 2011,

⁷ Vyverman & Compère 1991, ⁸ Potapova et al. 2003

Valve size

Small (L:8.4–

Small to

Medium to

Small (L:12–27,

Small (L:5–34, W:2–

Small (L:5–29,

25.2, W:1.6–3.7

medium (L:7–

large (L:50–

W:1.4–3 µm)

12 µm)

W:2–6 µm)

µm)

78, W:2.5–10

110, W:6.5–15

µm)

Valve

Bilateral

Dorsi-ventral or

Bilateral

Slightly

symmetry

or slightly

bilateral

asymmetric,

asymmetric

heterovalvar

Valve shape

Linear

Elliptical or

Linear or

Linear lanceolate

Linear lanceolate,

Linear

lanceolate

linear lanceolate

broadly

elliptical, rhombical-

lanceolate

lanceolate or undulate

Apex

Broadly round

Cuneate, rostrate

Broadly round

Subcapitate or

Subcapitate, capitate

Subcapitate,

to subcapitate

or subrostrate

or slightly

capitate

or broadly round

capitate or

cuneate

slightly cuneate

Striae

Not chambered,

İncludes two

Chambered

Not chambered,

Chambered,

Not chambered,

composed of

kinds of areolae,

with two

composed of two

composed

two rows of

one in valve

alveoli

rows of areolae,

rows of macroareolae,

of elliptic

macro areolae,

face with broad

composed of

one macroareola

one on valve face

areolae, Areolae

one on valve

areolae, not

macroareolae

on valve face and

and one on mantle,

transapically

face and one on

chambered

occluded

one circular on

sometimes circular

elongated,

mantle

and the other

by small

mantle

external

marginally

multiseriate

openings of

chambered

poroids, one

areolae larger

Composed

on valve face

than internal

of two,

and the other

openings

three or four

extending onto

transapically

the mantle

circle or slit-like

broad openings

on mantle

Occlusion in

Hymenate

Absent

Hymenate with

Covered by vela

Hymenate

external valve

lineolate pores

face

Occlusion in

Foriculate

Present (delicate

Absent

internal valve

porous strip,

face

called cribra)

Internal

Straight or

Simple and

Arcuate or bent

Slightly bent to

slightly bent to one

Straight or T-

central raphe

slightly bent to

straight

to one side

one side

side or strongly

shaped ends

endings

one side

deflected

Internal polar

Simple and

Bent to one side

Deflected to

Simple and

Simple and straight

Simple and

raphe endings

straight

or straight

one side

straight

External central raphe endings

Straight and slightly expanded

Slightly expanded or simple, indistinct

Simple and straight or slightly expanded and slightly bent to one side

Straight

Straight or slightly bent to one side, expanded with small distinct pores

Slightly expanded or straight

External polar raphe endings

Deflected to the same side

Deflected to the same side or straight

Simple and straight or deflected to one side

Deflected to the same side

Helictoglossa

Shallow and present at ends

Present at ends

Very small and present at ends

Small and present at ends

Shallow and present at ends

Girdle bands

Simple

Porous

Simple

Habitat

Hypersaline

Freshwater-marine

Marine-brackish

Freshwater

Freshwater or marine

Freshwater

Raphe

Central, externally straight and internally slightly curved

Central or eccentric, straight or biarcuate

Central, straight

Central, slightly curved and short not reaching the center

Central, internally straight or slightly curved, externally straight or slightly arched

Central, slightly curved, heterovalvar (may be reduced or absent on one valve)

Hyaline longitudinal lines or areas

Absent

As a line near the valve margin interrupting the stria and forming a marginal chamber

As a line near the valve margin separating the two alveoli

Absent

As a line near the margin of the valve or as areas (only C. witkowskii ), in some species absent

Absent

Central area

Indistinct and small

Indistinct or forming a fascia

Forming a fascia or round, sometimes extended to one side with irregular thickenings

Linear

Swollen or undulate with a fascia or indistinct and small

Asymmetric to apical axis

Axial area

Narrow

Broad, in some species forming a conopeum

Broad

Narrow

Narrow or rather broad

Linear to lanceolate

persistent identifier: http://table.plazi.org/id/04B16645FFDAFFCDFF6CFDE0A14F0746

Published as part of Kheiri, Somayyeh, Edlund, Mark B., Spaulding, Sarah, Solak, Cüneyt Nadir, Sabouri, Jafar, Izadi, Bahman, Peszek, Łukasz (2024). Lutophila gen. nov., a new diatom genus from the hottest place on Earth, Lut Desert, Iran. Phytotaxa 641 (2): 99-111. DOI: 10.11646/phytotaxa.641.2.2, URL: http://dx.doi.org/10.11646/phytotaxa.641.2.2 on pages 103-104