World Database of Free-Living Marine Nematodes

Linked to the Marine Biology Section, UGent

Politomous Key of Rhynchonema Cobb, 1920

Polytomous key based on the somatic diagnostic of Rhynchonema Cobb, 1920 species, from: Bezerra, T. N.; Smol, N.; Vincx, M. (2014). Two new species of Rhynchonema Cobb, 1920 from a Brazilian sandy beach. Marine Biodiversity. 44(3): 343-365. DOI 10.1007/s12526-014-0223-6Datta, T. K.; Navarrete, A. D. J.; Mohapatra, A. (2015) Rhynchonema dighaensis sp. nov. (Monhysterida: Xyalidae): a marine nematode from the Indian coast with an illustrated guide and modified key for species of Rhynchonema Cobb, 1920. Zootaxa, 3905(3): 365-380. DOI 10.11646/zootaxa.3905.3.3
Key created by Tania Nara Campinas Bezerra


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Characteristics

click to expand Amphid size/shape showing sexual dimorphism (H) Pictorial key
click to expand Amphids at the end of the pharyngostome (L) Pictorial key
click to expand Amphids before the end of the pharyngostome (K) Pictorial key
click to expand Amphids behind the end of the pharyngostome (M) Pictorial key
click to expand Amphids of equal size (I) Pictorial key
click to expand Amphids only slightly larger in males (J) Pictorial key
click to expand Amphids position showing sexual dimorphism (N) Pictorial key
click to expand Amphids with spiral structure (O) Pictorial key
click to expand Annuli with vacuoles (R) Pictorial key
click to expand Distal end of spicules bifid (E) Pictorial key
click to expand Distal end of spicules in a claw (D) Pictorial key
click to expand Distal end of spicules pointed (C) Pictorial key
click to expand Gubernaculum with apophysis (G) Pictorial key
click to expand Lateral differentiation (ridges) (Q) Pictorial key
click to expand Presence of capitulum (F) Pictorial key
click to expand Presence of pre-cloacal supplements (P) Pictorial key
click to expand Spicules asymmetric (B) Pictorial key
click to expand Spicules symmetric (A) Pictorial key
click to expand Vulva annulation stronger than the rest of the body (U) Pictorial key
click to expand Vulva covered with flap/operculum (S) Pictorial key
click to expand Vulva flap madreporite (T) Pictorial key
 
Remaining taxa:
Rhynchonema amakusanum Aryuthaka, 1989

Rhynchonema ambianorum Boucher, 1974

Rhynchonema brevituba Gerlach, 1953

Rhynchonema cemae Bezerra, Smol & Vincx, 2014

Rhynchonema ceramotos Boucher, 1974

Rhynchonema chiloense Lorenzen, 1975

Rhynchonema cinctum Cobb, 1920

Rhynchonema collare Nicholas & Stewart, 1995

Rhynchonema deconincki Vitiello, 1967

Rhynchonema dighaensis Datta, Navarrete & Mohapatra, 2015

Rhynchonema dispar Gourbault, 1982

Rhynchonema falciferum Boucher, 1974

Rhynchonema fossum Lorenzen, 1975

Rhynchonema gerlachi Vitiello, 1967

Rhynchonema hirsutum Hopper, 1961

Rhynchonema impar Lorenzen, 1975

Rhynchonema kikuchii Aryuthaka, 1989

Rhynchonema longituba Gerlach, 1953

Rhynchonema lyngei (Allgén, 1940) Gerlach, 1953

Rhynchonema megamphidum Boucher, 1974

Rhynchonema moorea Boucher, 1974

Rhynchonema ornatum Lorenzen, 1975

Rhynchonema ornatum antillensis Gourbault, 1982

Rhynchonema quemer Boucher, 1974

Rhynchonema scutatum Lorenzen, 1972

Rhynchonema semiserratum Lorenzen, 1975

Rhynchonema separatum Lorenzen, 1975

Rhynchonema sieverti Gourbault, 1982

Rhynchonema subsetosum Murphy, 1964

Rhynchonema tomakinense Nicholas & Stewart, 1995

Rhynchonema tremendum Lorenzen, 1975

Rhynchonema veronicae Bezerra, Smol & Vincx, 2014

Rhynchonema xiamenensis Huang & Liu, 2002


 

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