Comaldessus stygius Spangler and Barr, 1995

Miller, Kelly B., Gibson, James R. & Alarie, Yves, 2009, North American Stygobiontic Diving Beetles (Coleoptera: Dytiscidae: Hydroporinae) with Description of Ereboporus naturaconservatus Miller, Gibson and Alarie, New Genus and Species, from Texas, U. S. A, The Coleopterists Bulletin 63 (2), pp. 191-202: 196-197

publication ID

http://doi.org/ 10.1649/1124.1

DOI

http://doi.org/10.5281/zenodo.5301487

persistent identifier

http://treatment.plazi.org/id/D909CC26-7C05-041F-6D33-FA39FEC0251F

treatment provided by

Valdenar

scientific name

Comaldessus stygius Spangler and Barr, 1995
status

 

Comaldessus stygius Spangler and Barr, 1995  

( Figs. 6–8)

Comaldessus stygius Spangler and Barr 1995: 302   ; Nilsson 2001: 119; Larson et al. 2000: 101.

Type Species. Comaldessus stygius Spangler and Barr, 1995   by original designation.

Type Locality. U.S.A., Texas, Comal County, New Braunfels, Landa Park , Comal Spring #3   .

Diagnosis. This species can be distinguished from other taxa within Bidessini   using the following character combination: 1) eyes rudimentary, indicated by only a few ommatidia; 2) metacoxal lines absent; 3) occipital line absent ( Fig. 6); 4) basal pronotal and basal elytral striae (‘‘plicae’’) present ( Fig. 6).

Discussion. Comaldessus stygius   was described from twelve specimens collected in drift nets from Comal Springs (Spangler and Barr 1995), a system of artesian springs.

Relationships. This species is clearly a member of the tribe Bidessini   based on the 2-segmented parameres ( Biström 1988) and the presence of basal pronotal and elytral striae ( Fig. 6) which are characteristic of many Bidessini ( Biström 1988). Spangler and Barr (1995) speculated that the species is related to Trogloguignotus Sanfilippo   and Uvarus Guignot   and that both Trogloguignotus   and Comaldessus   are derived from within the species-rich, plesiomorphic Uvarus   , though without a cladistic analysis of this problematic tribe, it is difficult to make definitive conclusions.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Dytiscidae

Genus

Comaldessus

Loc

Comaldessus stygius Spangler and Barr, 1995

Miller, Kelly B., Gibson, James R. & Alarie, Yves 2009
2009
Loc

Comaldessus stygius

Nilsson 2001: 119
2001