Exumellina bucculenta - Species Card - Marine Planktonic Copepods

Species Card of Copepod

Calanoida ( Order )	details
Epacteriscoidea ( Superfamily )	details
Ridgewayiidae ( Family )	details
Exumellina ( Genus )	details	List species for this Genus

Exumellina bucculenta Fosshagen, 1998 (F,M)

Abbreviations or symbols

Ref.:

(

List of the studied authors )

in Fosshagen & Iliffe, 1998 (p.376, figs.F,M); Barthélémy, 1999 a (p.10, fig.)

Species Exumellina bucculenta - Plate 1 of morphological figures

issued from : A. Fosshagen & T.M. Iliffe in J. Marr. Syst., 1998, 15 [p.375, Fig.2].
Female (from Bahamas): A-B, habitus (lateral and dorsal, respectively); C, rostrum and frontal part of head; D, urosome (lateral); E, idem with spermatophore (lateral); F, urosome (ventral); G, A1; H, A2; I, Md; J, Mx1; K, Mx2.

Nota:
Head and 1st pedigerous somite separated only by a weak dorsal suture. Caudal rami about twice as long as wide and with 6 elements, one being a small posterolateral outer spine.
A1 27-segmented with segments II and III partially separated; extending backward to end of genital double-somite; particularly long setae present on segments V, IX, XI, XIV, XX, XXII, XXVI.
A2 with exopod 1.5 times longer than endopod; exopod 7-segmented with 11 setae; endopod 2-segmented and compressed with last segment having distinct inner lobe bearing 9 setae.
Md with well-developed cutting blade bearing pointed teeth along most of its margin, except for 2 broad and distally serrated teeth on outer margin; Basis of palp unarmed; endopod 2-segmented about twice length of exopod, 1st segment with 1 inner seta, 2nd segment trnasformed into an elongated, flattened thin structure bearing 5 small setae along inner margin and 2 small distal ones.
Mx1 with slender praecoxal arthrite having 14 elements; coxal endite and basal endites with 3 and 4 setae respectively; exopod with 2 groups of setae, each with 5 setae; endopod 2-segmented, extremely elongated into flattened and thin structure bearing 3 groups of 4, 3 and 5 small setae, respectively, on inner margin.
mx2 compressed, with indistinctly segmented terminal part; 1st praecoxal endite with 4 (5 ?) setae.

Species Exumellina bucculenta - Plate 2 of morphological figures

issued from : A. Fosshagen & T.M. Iliffe in J. Marr. Syst., 1998, 15 [p.377, Fig.3].
Female: A, Mxp; B, P1; C, P2; D, P3; E, P4; F, P5.

Male: G, habitus (lateral); H, right A1; I, left P5 (anterior); J, right P5 (posterior).
Nota: Urosome 5-segmented. Right A1 geniculate, 22-segmented with two partial divisions of segment 2, segment 22 armed with stylet-like process and 1 aesthetasc distally on anterior margin.

Species Exumellina bucculenta - Plate 3 of morphological figures

issued from : R.-M. Barthélémy in These Doc. Univ. Provence (Aix-Marseille I), 1999 [Fig.15, G].
Female (from Norman's pond cave: Bahamas): G, external ventral view of genital double-somite.
go = genital operculum (note the bilobated lobe). Scale bar: 0.010 mm.

NZ:

Distribution map of Exumellina bucculenta by geographical zones

Loc:

(

Geographical glossary )

Bahamas Islands (Norman's Pond Cave, Exuma Cays)

Lg.:

(

References of the authors concerning dimensions )

(763) F: 0,77-0,69; M: 0,69-0,61; {F: 0,69-0,77; M: 0,61-0,69}

Rem.:

anchialine cave.
For Fosshagen & Iliffe (1998, p.379) the very delicate mandibular and maxillular endopods may suggest a food item that is soft or flimsy. The mandibular gnathobase with its pointed teeth seems to have a piercing function rather than a crushing one. Mx1 (In most calanoids the endopod of Mx1 is compressed and densely setose) is elongated and with setae in 3 groups, pointing to the ancestral 3-segmented condition of the endopod. The 2 groups of setae in the exopod may be indicative of a 2-segmented ancestral condition of this ramus.

Last update : 05/01/2015


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