Terrestricythere elisabethae, Horne & Smith & Whittaker & Murray, 2004, Horne & Smith & Whittaker & Murray, 2004

Horne, David J., Smith, Robin J., Whittaker, John E. & Murray, John W., 2004, The first British record and a new species of the superfamily Terrestricytheroidea (Crustacea, Ostracoda): morphology, ontogeny, lifestyle and phylogeny, Zoological Journal of the Linnean Society 142 (2), pp. 253-288: 263-271

publication ID

http://doi.org/ 10.1111/j.1096-3642.2004.00134.x

persistent identifier

http://treatment.plazi.org/id/74788546-FFBC-512D-FF2B-FF6AFA58F88B

treatment provided by

Diego

scientific name

Terrestricythere elisabethae
status

sp. nov.

T. elisabethae   sp. nov.

An2: five podomeres, coxa large and broad ( Fig. 8 View Figure 8 ). Basis wider than long. Exopodite plate with one broad, rounded, short seta. 1st endopodite podomere with two short, lobe-like setae on posterior edge; 2nd with one short and one longer lobe-like posterior-apical setae. Final podomere with four rounded, lobe-like setae, two larger of which are hooked.

Md: segmentation indistinct ( Fig. 8 View Figure 8 ). Lobe on inner edge incipient coxa (?). Palp with two lobes on inner edge and terminates with three small lobes.

Lobe X: lobe anterior to Fu; elongate and hook shaped ( Fig. 8 View Figure 8 ).

Fu: rami triangular in shape, broad base, slightly curved distally ( Fig. 8 View Figure 8 ).

Ab: lobe at posterior of body, with rounded end ( Fig. 8 View Figure 8 ).

Instar A-7

Carapace: length 152–160 Mm, height 96–100 Mm. Calcified ( Fig. 2). Lateral view rounded, with LV overlapping RV. Anterior slightly more rounded than posterior. Maximum height approximately at mid-length. Dorsal margin strongly curved, ventral margin straight. RV with list. Carapace surface smooth. Each valve with nine pore systems ( Fig. 4 View Figure 4 ).

An1: all setae more robust, and longer than in previous instar ( Fig. 8 View Figure 8 ). 2nd podomere with additional apical seta. 5th podomere with three apical setae and one apical aesthetasc.

An2: exopodite now with one long seta with hooked end, one short seta and one small lobe ( Fig. 8 View Figure 8 ). Basis with additional one small mid-positioned seta. 2nd endopodite podomere with one posterior-apical claw and one aesthetasc. Final podomere with three stout claws and one bent aesthetasc.

Md: coxa with four teeth and one subapical seta on outer edge ( Fig. 8 View Figure 8 ). Exopodite consisting of one long seta. 1st endopodite podomere with three apical setae on inner corner; 2nd with one apical claw and one apical seta on inner corner; 3rd with three claws.

Mx: Anlage consisting of rounded lobe, directly behind Md ( Fig. 8 View Figure 8 ).

Fu: rami short, stout and rounded, with many setules on posterior edge ( Fig. 8 View Figure 8 ), terminating with two short, stout claws and one long claw with thin seta protruding from distal half; seta longer than claw.

Ab: directly posterior of Fu, consisting of stout setulous end ( Fig. 8 View Figure 8 ).

Instar A-6

Carapace: length 170–190 Mm, height 105–130 Mm. Carapace shape similar to that of previous instar ( Fig. 2). Each valve with 18 pore systems ( Fig. 4 View Figure 4 ).

An1: 2nd podomere with additional small, stout seta on dorsal-apical corner ( Fig. 9 View Figure 9 ). 4th podomere with additional apical claw and seta.

An2: coxa with additional seta on posterior edge ( Fig. 9 View Figure 9 ). Exopodite with one additional long, hooked seta. 1st endopodite podomere with two additional aesthetascs on posterior edge; 2nd with one additional claw on anterior-apical corner.

Md: coxa with additional tooth ( Fig. 9 View Figure 9 ). 2nd endopodite podomere with additional seta on outer-apical corner.

Mx: transformed from Anlage to feeding appendage; palp simple, not segmented, terminating in one stout, curved claw ( Fig. 9 View Figure 9 ). 3rd endite terminates with one stout seta, 2nd with three, 1st with two. Branchial plate formed (number of setae unknown as folded in all specimens).

Fu: each ramus with additional long claw, similar to pre-existing long claw, with thin seta protruding from distal half ( Fig. 9 View Figure 9 ).

Instar A-5

Carapace: length 205–220 Mm, height 128–144 Mm. Overall shape similar to previous instar ( Fig. 2). Each valve with 35 pore systems ( Fig. 4 View Figure 4 ).

An1: similar to that of previous instar ( Fig. 10 View Figure 10 ).

An2: 1st endopodite podomere with one additional aesthetasc, now forming group of three ( Fig. 10 View Figure 10 ). Exopodite with additional long, hooked seta, forming group of three long setae, one short seta and one small lobe.

Md: additional seta protruding from inner edge of basis ( Fig. 10 View Figure 10 ).

Mx: endopodite segmented; 1st podomere with one stout, curved seta on apical-outer edge ( Fig. 10 View Figure 10 ). 2nd podomere with additional stout apical seta, forming group of two. Endites with numerous apical setae (number unknown).

L5: Anlage; rounded elongate lobe, tapering distally to point ( Fig. 10 View Figure 10 ).

Fu: similar to that of previous instar ( Fig. 10 View Figure 10 ).

Instar A-4

Carapace: length 235–260 Mm, height 152–163 Mm. Overall shape similar to previous instar ( Fig. 2). Each valve with 47–50 pore systems ( Fig. 4 View Figure 4 ).

An1: 2nd podomere with additional long seta on ventral edge; 4th with additional apical short seta, forming group of five ( Fig. 11 View Figure 11 ).

An2: coxa with additional seta on anterior edge ( Fig. 11 View Figure 11 ). Exopodite with four long setae. 2nd endopodite podomere with new aesthetasc on posterior edge and small claw on anterior-apical corner; 3rd with four stout claws.

Md: endopodite with two new setae on inner edge ( Fig. 11 View Figure 11 ).

Mx: endopodite with one new apical seta on 1st podomere and new apical seta on final podomere. Additional large, broad, setulous seta near base of 2nd endite ( Fig. 11 View Figure 11 ).

L5: transformed from Anlage; four podomeres, 1st podomere (protopodite) robust and broad, tapering distally, with three small, stout, anterior-apical claws and long seta (exopodite) on posterior edge. 2nd podomere elongate; 3rd quadrate with small anteriorapical spine; 4th trapezoid with one small seta on posterior edge, one small apical claw and one long apical claw ( Fig. 11 View Figure 11 ).

L6: Anlage; rounded elongate lobe, tapering distally to point ( Fig. 11 View Figure 11 ).

Fu: each ramus reduced to two small spines and one long claw ( Fig. 11 View Figure 11 ).

Instar A-3

Carapace: length 287–300 Mm, height 178–185 Mm. Overall shape similar to previous instar ( Fig. 2). Each valve with 55–59 pore systems ( Fig. 4 View Figure 4 ).

An1: 2nd podomere with extra seta on ventral edge next to existing long seta ( Fig. 12 View Figure 12 ). 4th podomere with two new setae at mid-point of dorsal edge.

An2: basis with additional seta on anterior-apical corner ( Fig. 12 View Figure 12 ). Exopodite with one new, long, seta producing group of five long and one short setae. 2nd endopodite podomere with additional, small, stout claw on posterior edge and small stout claw on anterior-apical corner.

Md: endopodite with extra seta on outer-apical corner of 2nd podomere ( Fig. 12 View Figure 12 ).

Mx: endopodite with new seta on outer edge of 1st podomere ( Fig. 12 View Figure 12 ).

L5: 3rd podomere with additional small spine on anterior-apical corner ( Fig. 13 View Figure 13 ).

L6: transformed from Anlage ( Fig. 13 View Figure 13 ). 1st podomere large and robust with one seta on anterior-apical corner; 2nd elongate; 3rd elongate with small, stout claw on anterior-apical corner; 4th small and trapezoid, with small seta on posterior edge and one long claw and one shorter claw apically.

L7: Anlage; rounded elongate lobe, tapering distally to point ( Fig. 13 View Figure 13 ).

Fu: Each ramus reduced further to two small, setulous claws ( Fig. 13 View Figure 13 ).

Instar A-2

Carapace: length 343–360 Mm, height 218–230 Mm. Overall shape similar to previous instar ( Fig. 2). Each valve with 71–80 pore systems ( Fig. 4 View Figure 4 ).

An1: 3rd podomere with additional apical seta; 4th with extra seta along dorsal edge and additional seta on ventral-apical corner ( Fig. 14 View Figure 14 ).

An2: exopodite with additional long seta ( Fig. 14 View Figure 14 ).

Md: basis with two extra setae on inner edge ( Fig. 14 View Figure 14 ). 1st endopodite podomere with one additional seta on inner edge and two new setae on outer edge.

Mx: 1st endopodite podomere with extra seta on outer-apical edge ( Fig. 15 View Figure 15 ).

L5: protopodite with additional stout seta on anteriorapical corner and additional long, subapical seta ( Fig. 15 View Figure 15 ).

L6: now with five podomeres as result of 3rd podomere in previous instar dividing into two ( Fig. 15 View Figure 15 ). Protopodite with additional long seta (exopodite) on posterior edge. 2nd podomere with new spine on anterior-apical corner. 3rd podomere wider than long and with robust spine on anterior-apical corner. 4th podomere wider than long and with robust spine and three smaller spines on anterior-apical corner. Final podomere similar to that of final podomere in previous instar.

L7: Transformed into appendage with four podomeres ( Fig. 15 View Figure 15 ). 1st podomere elongate, with two small, stout, anterior-apical setae; 2nd and 3rd elongate; 4th small, trapezoid, with one short, curved claw and one long, curved claw.

Fu: Similar to previous instar ( Fig. 15 View Figure 15 ).

Instar A-1

Carapace: Length 413–426 Mm, height 265–265 Mm. Overall shape similar to previous instar ( Fig. 2). Each valve with 99–106 pore systems ( Fig. 4 View Figure 4 ).

An1: 3rd podomere with two additional, stout apical setae, producing group of four; 4th with one extra,

stout setae in mid-length position producing group of four ( Fig. 16 View Figure 16 ).

An2: Exopodite with additional long seta, producing group of seven long and one short setae. 1st endopodite podomere with one new, small claw on posterior-apical corner; 2nd with one additional claw on posterior edge and one new anterior-apical claw ( Fig. 16 View Figure 16 ).

Md: 2nd podomere of endopodite with additional small, apical seta on inner edge ( Fig. 16 View Figure 16 ).

Mx: similar to that of previous instar ( Fig. 16 View Figure 16 ).

L5: 3rd podomere with additional small, anteriorapical spine ( Fig. 17 View Figure 17 ).

L6: 1st podomere with two additional setae on anterior edge, and one new anterior-apical seta ( Fig. 17 View Figure 17 ).

L7: now with five podomeres with 3rd podomere in previous instar dividing. 1st podomere with additional small seta on anterior edge ( Fig. 17 View Figure 17 ).

Fu: similar to that of previous instar ( Fig. 17 View Figure 17 ).

Instar adult

Carapace: length 480–500 Mm, height 322–340 Mm. Dorsal margin slightly more inflated than in previous instar. Each valve with 142–153 pore systems ( Fig. 4 View Figure 4 ).

An1, An2, Md and Mx: similar to that of previous instar ( Fig. 5 View Figure 5 ).

L5: male L5 with two long and three short stout setae on anterior edge ( Fig. 6 View Figure 6 ). 4th podomere used with large terminal hook. Female L5 similar to that of previous instar ( Fig. 6 View Figure 6 ).

L6: 2nd, 3rd and 4th podomeres each with one additional small, anterior-apical spine ( Fig. 6 View Figure 6 ).

L7: more elongate than in previous instar ( Fig. 6 View Figure 6 ).

Fu: in males fused with base of hemipenes ( Fig. 6 View Figure 6 ). Similar to previous instar in females ( Fig. 6 View Figure 6 ).

Hem: fully developed ( Fig. 6 View Figure 6 ).

Remarks on ontogeny

The appearance of limbs through ontogeny of Terrestricythere elisabethae   sp. nov. is generally similar to that of other podocopid superfamilies, such as the Cypridoidea   , Cytheroidea   and Bairdioidea ( Fig. 20 View Figure 20 ). The first instar (A-8) of the Cypridoidea   , Cytheroidea   and Terrestricytheroidea   consists of the antennulae, antennae and the Anlagen of the mandibles ( Fig. 21 View Figure 21 )