Indobaetis Muller-Liebenau & Morihara 1982
Creators: name: Kluge, Nikita J.
name: Novikova, Eugenia A.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Indobaetis

description: Indobaetis Müller-Liebenau & Morihara 1982
(Figs 2–75)
Type species: Indobaetis costai Müller-Liebenau & Morihara 1982.
General characteristic given to Indobaetis by Müller-Liebenau & Morihara (1982) should be modified as the following.
Apomorphies of Indobaetis.
(1) Each mandible has incisor and kinetodontium completely fused together forming an integral plate with cutting edge widened, evenly dentate and vaulted ventrally, so that its part corresponding to incisor is less projected medially than its part corresponding to kinetodontium (Figs 46–48; Müller-Liebenau & Morihara 1982: Figs 1 f, 2f).
(2) Prostheca of right mandible is slender and pointed, not bifurcate (Figs 47, 48; Müller-Liebenau & Morihara 1982: Figs 1 f, 2f) (see Discussion, 2.4).
(3) Maxilla has 2 dentisetae: 1st dentiseta (most distal) is thick and adjacent to maxillary canines (as in many other Baetidae); 2nd dentiseta is sharply arched and pressed to the first dentiseta, so that its middle part is hidden between the first dentiseta and the canines; 3rd dentiseta is absent; setae of median-dorsal row form a compact bunch, basally adjacent to the second dentiseta and distally diverging from it (Figs 10, 51). In other Baetidae three dentisetae, initial for Tridentiseta Kluge et al. 1995, are retained (Kluge 2004: Figs 28 B, D).
(4) Larval tibia has a regular row of stout setae on outer margin, different from setae of a regular row on outer margin of femur (Figs 22, 67, 68).
(5) Larval claw has distal denticle enlarged, with at least one strong seta posteriad of it (Figs 42, 58) (see Discussion, 2.7).
(6) Hind wings are absent; larva has no vestiges of hind protoptera (Müller-Liebenau & Morihara 1982: Figs 1 i, 2g).
(7) Tergalii of first pair are lost, only 6 pairs of tergalii are present.
(8) In mature larva buds of subimaginal gonostyli are folded by « Labiobaetis - type » (Figs 28, 29); this character is known only for I. costai (see Discussion, 2.10)
(9) On fore leg of female subimago and imago 1st tarsomere is completely fused with 2nd tarsomere, so the tarsus is 4-segmented (Figs 2–5), like tarsi of middle and hind legs (Fig. 11). This character is known for I. costai and I. microfolius sp.n. In most other Baetidae fore tarsus of female subimago and imago has 1st tarsomere well separated from 2nd tarsomere (Fig. 1) (see Discussion, 2.12).
Character of Indobaetis of unclear phylogenetic polarity.
(10) In subimago, 1st and 5th tarsomeres are covered mainly with pointed microlepides, other tarsomeres mainly with blunt microlepides (Figs 5–8, 11–17); this character is known for I. costai and I. microfolius sp.n. (see Discussion, 2.13)
Plesiomorphy of Indobaetis.
(11) Sterno-styligeral muscle is retained (Figs 21, 24, 54); this character is known for I. costai and I. microfolius sp.n. (in contrast to Labiobaetis, Baetosternata and some other taxa, whose sterno-styligeral muscle is completely lost—see Discussion, 2.11).
Characters variable among species of Indobaetis. Larval habitus varies from Nigrobaetis -like in I. costai and I. starmuehlneri (i.e., with head bowed ventrally, head and thorax laterally compressed, three caudalii and their primary swimming setae well developed) to Acentrella -like in I. microfolius sp.n. (i.e., head and thorax flattened ventrally, paracercus reduced, and swimming setae lost). Frons varies from narrow and keeled to wide and flat (Figs 40, 41, 55). Maxillary palp, being 2-segmented (as in all Baetungulata), has 2nd segment either incised (in I. costai), or not (in other species—Fig. 51). Transverse row of fine setae on glossa is either present (in I. costai and I. starmuehlneri), or absent (in I. microfolius sp.n. — Fig. 50). Labial palp either has structure usual for Baetidae (in I. starmuehlneri), or has 2nd segment unusually narrowed (in I. costai), or has 2nd and 3rd segments completely fused together and lacking muscle (in I. microfolius sp.n. — Fig. 52). Patella-tibial suture, being equally developed on all legs (that is characteristic for Anteropatellata), either has normal shape (in I. costai and I. starmuehlneri — Fig. 22), or is smoothed and stretches along tibia (in I. microfolius sp.n. — Fig. 67). Larval paraproct either has tongue-like denticulate prolongation of inner posterior edge (in I. costai and I. starmuehlneri — Figs 38, 39), or with posterior margin non-expressed (in I. microfolius sp.n. — Fig. 72).
Distribution. Southern India and Sri Lanka.
Species composition. 3 species: Indobaetis costai Müller-Liebenau & Morihara 1982, I. starmuehlneri Müller-Liebenau & Morihara 1982 and I. microfolius sp.n.
Comments. Selva-kumar et al. (2012) described Indobaetis michaelohubbardi based on larvae from southern India. Subsequent reexamination of the type specimens reveals that this species has hind protoptera and other characters of Baetis s.str. (K.G. Sivaramakrishnan, personal communication). In the photo (Selva-kumar et al. 2012: Fig. 34) three maxillary dentisetae are visible, that allows to exclude this species from Indobaetis. According to the photos (Selva-kumar et al. 2012: Figs 29–38) this species belongs to subgenus Tenuibaetis Kang & Yang (in Kang et al.) 1994 of the genus Baetis s.str. So, the valid binomen is Baetis michaelohubbardi (Selva-kumar et al. 2012), comb.n.
description: Published as part of Kluge, Nikita J. & Novikova, Eugenia A., 2014, Systematics of Indobaetis Müller-Liebenau & Morihara 1982, and related implications for some other Baetidae genera (Ephemeroptera), pp. 209-236 in Zootaxa 3835 (2) on pages 214-215, DOI: 10.11646/zootaxa.3835.2.3, http://zenodo.org/record/250181