Clypeocaenis
Creators: name: Vannachak, Viengkhone
name: Malzacher, Peter
name: Sangpradub, Narumon
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Caenidae
Clypeocaenis

description: Key to the larvae of Oriental Clypeocaenis species
1 Clypeal protrusion with 4 or more setae.................................................................... 2
– Clypeal protrusion with two setae........................................................................ 4
2 Clypeal protrusions with 20–35 long setae.These setae, along with those on the body surface, often possess many thin, irregularly arranged, and matted branches, creating what are referred to as sausage-shaped setae (Malzacher 2013, Figs. 37–39).................................................................................................. Cl. soldani
– Clypeal protrusion with less than 20 long setae. Surface without sausage-shaped bristles, but with shield-shaped microtrichia (Fig. 9A, C).......................................................................................... 3
3 Clypeal protrusions with 10–15 long setae (Fig. 9A). The cuticle features shield-shaped, spider web-like microtrichia with smooth margins (Fig. 8C).................................................................... Cl. multisetosa
– Clypeal protrusion with about 4 long setae and several short ones (Fig. 6A). Shield-shaped microtrichia with frayed margin (Fig. 8A)................................................................................. Cl. oligosetosa
4 Mid and hind femora with long, acute marginal setae (Soldán 1978, Figs. 9, 10, 21). Operculate gill’s length more than twice its width, with blunt or spatulate marginal setae (Balasubramanian & Muthukatturaja 2021, Fig. 31).................... 5
– Mid and hind femora with short marginal setae (Fig. 3D, E). Operculate gill with very short length not more than 2 time as width, blunt or spatulate marginal setae, on lateral margin very short or absent (Balasubramanian & Muthukatturaja 2021, Fig.14)............................................................................................. 8
5 Fore tarsus and the distance between the transverse rows of bases of filtering setae on the foretibia are of equal length (Soldán & Landa 1991, Fig. 14)................................................................... Cl. femorisetosa
– Fore tarsus 1.7 to 2 times as long as the distance between the transverse rows of bases of filtering setae on the foretibia (Soldán 1983, Fig. 12)........................................................................................ 6
6 Genae margin angled. Foreleg with feathered bristles in some places, e.g. marginal on coxae and femora (Muthukatturaja et al. 2020, Fig. 27).............................................................................. Cl. sharadhae
– Genae differently shaped. Fore leg without feathered bristles................................................... 7
7 Apical margins of the clypeal protrusion straight (Soldán 1978, Fig. 16). The third segment of the labial palp hardly widened basally (Soldán 1978, Fig. 3).................................................................... Cl. bisetosa
– Apical margin of the clypeal protrusion rounded. The third segment of the labial palp significantly widened basally (Balasubramanian & Muthukatturaja 2021, Figs. 2, 26).............................................. Cl. napoklu
8 Clypeal protrusions markedly large, apically domed. Genae protruding, doubly angled, the margin between angles straight (Srinivasan et al. 2022, Fig. 2A).............................................................. Cl. malzacheri
– Clypeal protrusion flatly rounded, not domed apically........................................................ 9
9 Setae of transverse row on forefemur broad (Fig. 3A, B). Segment I of maxillary palp narrow, about half as wide as galea-lacinia (Fig. 2D). Setae on outer margin of mid and hind femora spatulate, with a very thin basal part (Fig. 3E, G). Claws of mid and hind legs with 3–5 denticles (Fig. 3F, H). Ventral side of operculate gill without microtrichia (Figs. 4G, 12F)............................................................................................. Cl. laosensis sp.nov.
– Setae of transverse row on forefemur narrow. Segment I of maxillary palp broadened, about as wide as galea-lacinia. Setae on outer margin of mid and hind femora thin, acute or bifid. Claws of mid and hind legs with 8–10 denticles (Balasubramanian & Muthukatturaja 2021, Figs. 7, 10–12;). Ventral side of operculate gill with a sublateral band of microtrichia (Fig. 10D).... 10
10 Pedicel two and a half time as long as third antennal segment; the latter about as long as the following segments; genae flatly angled. Segment III of labial palp basally strongly broadened Coxae enlarged, two third as wide as length of fore femur. Median ridge of operculate gill scarcely keeled (Muthukatturaja et al. 2020, Figs. 1, 7–10, 14)...................... Cl. gayathri
– Pedicel one and a half times as long as the third antennal segment; the latter distinctly longer than the following segments; genae margin not angled. Segment III of the labial palps not strongly broadened basally (Balasubramanian & Muthukatturaja 2021, Fig. 9). Coxa half as wide as the length of the forefemur. The median ridge of the operculate gill strongly keeled (Balasubramanian & Muthukatturaja 2021, Figs. 1, 10–12, 14).......................................... Cl. kaveri
description: Published as part of Vannachak, Viengkhone, Malzacher, Peter & Sangpradub, Narumon, 2024, Contribution to the genus Clypeocaenis Soldán, 1978 (Ephemeroptera: Caenidae) from Lao People's Democratic Republic with a key to Oriental species, pp. 501-523 in Zootaxa 5501 (4) on pages 517-518, DOI: 10.11646/zootaxa.5501.4.1, http://zenodo.org/record/13745355