A new species of Choroterpes Eaton, 1881 (Ephemeroptera: Leptophlebiidae) from the River Cauvery, Karnataka, India Author Muthukatturaja, Marimuthu Department of Zoology, Nadar Mahajana Sangam S. Vellaichamy Nadar College, Nagamalai, Madurai- 625019, Tamil Nadu, India. & Department of Zoology, Thiagarajar College, Madurai- 625009, Tamil Nadu, India. Author Balasubramanian, Chellaiah 0000-0001-8563-1677 Department of Zoology, Thiagarajar College, Madurai- 625009, Tamil Nadu, India. ulab62@yahoo.com Author Selvakumar, Chellappa 0000-0002-4296-5682 Department of Zoology, The Madura College, Madurai- 625011, Tamil Nadu, India. selvaaa06@gmail.com Author Murali, Palraju 0009-0008-1551-4860 Department of Zoology, Nadar Mahajana Sangam S. Vellaichamy Nadar College, Nagamalai, Madurai- 625019, Tamil Nadu, India. iniamurali76@gmail.com text Zootaxa 2025 2025-03-20 5609 2 151 173 https://doi.org/10.11646/zootaxa.5609.2.1 journal article 309260 10.11646/zootaxa.5609.2.1 80f8f3b4-a1a4-421c-8541-3e8a6ffdc245 1175-5326 15214892 5F701F77-90CD-49A1-86CB-20D1102A8E12

TABLE 2. Comparison of larval characters of known species of Indian Euthraulus except Choroterpes (E.) parvulus (whose larva still remains unknown).

Species	Labrum	transverse setal	Fore femur	Posterior margin	Posterolateral spine of	Tergalius I	Tergalius VII
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		row on labrum		of abdominal	terga VIII–IX
				terga
C. (E.) alagarensis	median	proximal row	margins and	terga I–II with	incised	present	lamella terminated
	emargination	arched, about 2	anterior side with	minute denticles;			with 3 processes
	sharply incised, with	times shorter than	stout setae, partly	terga III–X with
	denticles smoothed	distal row	smooth and blunt,	triangular pointed
	out or absent		partly pectinate and	denticles increasing
			pointed	from terga III–X
C. (E.) angustifolius	median	proximal row	margins and anterior	terga I–VIII with	terga VIII incised, on	present	lamella terminated
	emargination deep	straight, slightly	side with stout	minute denticles;	tergum IX non-incised		with 3 processes
	and wide	shorter than distal	non-pectinate setae,	terga IX–X with			or less number of
		row	partly blunt, partly	larger, triangular,			processes
			pointed	pointed denticles
C. (E.) armillatus	median	proximal row	margins and	terga I–III with	incised	present	lamella terminated
	emargination	unusually small,	anterior side with	minute denticles,			with 3 processes
	moderately deep,	about 5 times	stout setae, partly	terga IV–X with
	with denticles	shorter than distal	smooth and blunt,	small, triangular,
	smoothed out or	row	partly pectinate and	pointed denticles
	absent		pointed	increasing toward
				tergum X
C. (E.) atelobranchis	median	proximal row	margins and	terga I–II with	incised	absent	lamella terminated
	emargination	slightly arched,	anterior side with	minute denticles,			with 3 processes
	shallow, with 5 blunt	about 1.5 times	irregularly situated	of terga III–X
	denticles	shorter than distal	stout setae, partly	with long, pointed
		row	smooth and blunt,	denticles increasing
			partly pectinate and	toward tergum X
			pointed
		row on labrum		of abdominal	terga VIII–IX
				terga
C. (E.) kanagae sp.	median	proximal row	margins and anterior	terga I–II with	incised	absent	dorsal lamella
nov.	emargination	arched, about 1.5	side with stout	minute denticles,			terminated with 2
	moderately deep	times shorter than	spiky, spatulate,	of terga III–X			processes
	medially with 5	distal row	pectinate setae	with long, pointed
	blunt denticles			denticles increasing
				toward tergum X
C. (E.) latus	median	proximal row	margins and	terga I–X with	incised	present	lamella terminated
	emargination	straight, about 1.5	anterior side with	small, narrow,			with 3 processes
	shallow, with 5 blunt	times shorter than	irregularly situated	pointed denticles
	denticles	distal row	stout setae, partly	increasing toward
			smooth and blunt,	tergum X
			partly pectinate and
			pointed
C. (E.) nambiyarensis	median	proximal row	margins and anterior	terga I–VIII with	non-incised	present	dorsal lamella with
	emargination deep	slightly shorter	side with stout	minute denticles,			2 processes, ventral
	and narrow; without	than distal row	non-pectinate setae,	tergum IX with			lamella with 3
	5 denticles and 4	and forms 2 arcs,	partly blunt, partly	triangular, pointed			processes
	sensilla separating	either connected	pointed	denticles; tergum X
	them	or disconnected		with longer pointed
		medially		denticles
C. (E.) nandini	median	proximal row	margins and anterior	terga I–VIII with	terga VIII incised, of	present	lamella terminated
	emargination deep	arched, slightly	side with stout	minute denticles;	tergum IX non-incised		with 3 processes
	and sharp, with 5	shorter than distal	non-pectinate setae,	terga IX–X with
	denticles smoothed	row	partly blunt, partly	larger pointed
	out or absent		pointed	denticles
		row on labrum		of abdominal	terga VIII–IX
				terga
C. (E.) sp. «Mumbai»	median	proximal row	margins and anterior	tergum I with	non-incised	present	tergalius VII
	emargination sharp	slightly arched,	side with stout	minute denticles;			unknown
	and deep, without	about 1.5 times	setae, mostly non-	terga II–X with
	denticles	shorter than distal	pectinate and blunt,	narrow, pointed
		row	few setae pectinate	denticles increasing
			and pointed	from tergum II to
				tergum X
C. (E.) unicolor	median	proximal row	margins and anterior	terga I–III with	slightly incised	present	dorsal lamella with
	emargination	straight, about 1.5	side with stout	minute denticles,			2 processes, ventral
	sharply and	times shorter than	non-pectinate setae,	terga IV–VIII with			lamella with 3
	narrowly incised,	distal row	partly blunt, partly	narrow, pointed			processes
	without denticles		pointed	denticles increasing
				toward tergum
VIII, terga IX–X
with larger pointed
				denticles