New species of the earthworm genus Zapatadrilus (Clitellata, Acanthodrilidae) from northern Mexico
Author
Cervantes, Gabriela
Author
Fragoso, Carlos
Author
Monteros, Alejandro Espinosa De Los
Author
Sánchez-Ramos, Gerardo
Author
Lara-Villalón, Manuel
Author
Yañez-Pacheco, Manuel De Jesús
Author
Lázaro-Castellanos, Jesús Omar
Author
James, Samuel W.
text
Zootaxa
2016
4189
2
311
326
journal article
10.11646/zootaxa.4189.2.7
f07352e9-1e87-4255-8f16-da5d8bbc8ae5
1175-5326
263276
CDCB3C7B-EF82-479F-9A64-C58F0C40A4B6
Zapatadrilus huastecus
Cervantes & Fragoso
, sp nov.
(
Figures 2
,
4
C,F,G)
Localities
and material.
MEXICO
,
Tamaulipas
: (1)
Old
highway
Victoria-Jaumave
two kilometers after the
Balcony
of
Montezuma
,
Protected Natural Area
"
Altas Cumbres
".
Municipality
of
Ciudad Victoria. Oak forest
stony with little soil.
N 23
°
36' 2.28''
,
W 99
°
12' 53.75''
,
1341 m
asl. (
Fig. 6
A,B).
September 18th, 2013
.
Collectors G.
Cervantes and
O. Lázaro.
Holotype.
One clitellate adult, IEOL4490. Complete specimens, last segments amputated to obtain DNA.
Paratype.
One clitellate adult, IEOL4489. Complete specimens, last segments amputated to obtain DNA.
Additional material.
One incomplete clitellate adult, divided in two fragments, IEOL4492. Another incomplete clitellate adult, divided in two fragments and damaged during sampling, IEOL4493.
Description. External.
Length
144–172 mm
(mean=
158.3 mm
, n= 3;
holotype
172 mm
); postclitellar width
5.9–7.2 mm
(mean= 6.5, n= 4;
holotype
6.5 mm
). Segments 180–197 (mean=190.66, n=3;
holotype
197). Colour white. Prostomium closed epilobous, covering half of 1st segment. Secondary annulation: one postsetal in
4–9
, one presetal and one postsetal in
10–12
; one presetal and two postsetal in
13
. Setae eight per segment, visible from segment
2
, closely paired. Setal formula in anterior region (
aa:ab:bc:cd:dd
) in
10
: 2.4:1.0:4.0:1.1:16.0; in
30
: 3.8:1.0:4.5:1.5:20.0. Genital and penial setae absent. Annular clitellum vermilion red dorsally in
1/2
13
–18 (3 ind.), ventrally in
1/2
13
–1/2
17
interrupted in
AA
region of
17
by the male genital area (
Fig 2
A). Dorsal pores present all along the body, first pore in 13/14. Spermathecal pores paired in
8
and
9
, in
AB
, very close to 7/8 and 8/9, respectively (
Fig. 2
A). Female pores in
14
, presetal and slightly median to
A
, almost mesial, within an ovoid papilla extending
AB
(
Fig. 2
A). Two pairs of prostatic pores in
18
and
20,
very close to 18/19 and 20/21, respectively, just at the base of setae
b
and joined by square bracket-shaped seminal grooves, which run along
B
. Male pores in
19
near 19/20. Genital male area square-shaped in
1/2
17
–20. Genital markings unpaired midventrals in
7
,
8
and
9
, shape rectangular, extending beyond
B
(present in two specimens, absent in the other two specimens). Genital marking unpaired in
22–23
(present in
3 specimens
, absent in the other one), mid-ventral, ovoid-rectangular, extending beyond
B
. A tiny ovoid-rectangular papilla in
21
(present in one specimen, absent in the other three).
Holotype
with three rectangular swellings in
7
,
8
and
9
, extending beyond
B
, and ovoidrectangular genital papilla in
22–23
, extending beyond
B
(
Fig. 2
A).
FIGURE 2.
Zapatadrilus huastecus
sp. nov.
Holotype EOL4490.
A.
Anterior region of specimen, external ventral view.
B, C.
Right spermatheca from segment 7: dorsal view (B) and ventral view (C).
D–E.
Right spermatheca from segment
8
: dorsal view (D) and ventral view (E). Am= Ampulla, Di= Diverticulum, Du= Duct. Gm= Genital marking, Gp= Genital papilla. Scale bar 1 mm.
Internal.
Septa in 5/6–8/9 thick, muscular and funnel shaped; septa in
9/10 and 10/11
thin and membranous. Two gizzards, in
5
and
6
; the latter is the largest; both gizzards are preceded by a thin-walled esophagus. Mesentery covering the esophagus of segments
7
and
8
. Lateral and dorsal lamellae large in
11–13
, small in
9
and
10
. Coagulated blood in the body cavity in
10
and
11
. Calciferous glands absent. Intestine beginning in 17/18. Intestinal typhlosole simple, a thin line from
32
to
52
. Lateral typhlosoles absent. Intestinal caeca absent, intestine in
18–32
with a rough to pebbly appearance. Single dorsal vessel visible throughout. Supra-esophageal vessel visible in
10–12
. Lateral hearts in
6–9
. Latero-esophageal hearts in
10–12
. Ventral vessel present. Plectonephridia present, over 50 per segment (observed in segment 30).
Holandric. Testes in
10
and
11
, attached to iridescent male funnels by coaugulum, the latter are the largest. Two pairs of racemose seminal vesicles of similar size in
9
and
12
. Two pairs of tubulo-racemose prostates of similar size in
18
and
20
, tongue-shaped; muscular duct narrower and shorter than glandular part; central duct present, although very small and difficult to observe (
Fig. 4
C, F, G). Retractor muscles in
17–22
. Male ducts intraparietal. Ovaries one pair in
13
, arbuscular. Two pairs of spermathecae with sessile diverticulum, in
7
and
8
, opening to spermathecal pores in
8
(the anterior ones) and
9
(the posterior ones).
Holotype
with the four spermathecae not symmetrically placed; the anterior in segment
7
(right) and
6
(left), the posterior in
8
(right) and
9
(left); openings to spermathecal pores in
8
(the anterior ones) and
9
(the posterior ones). A short duct continues to an ovoidal or pear-shaped ampulla, which in some cases is considerably elongated. Each spermatheca with a single sessile diverticulum with multiple chambers (
Fig. 2
B–E).
Etymology.
The name
huastecus
refers to "huasteco", the gentilic adjective of the people from the Huasteca region.
Remarks.
Most similar to
Zapatadrilus huastecus
sp. nov
.
is
Z. aurelius
sp. nov.
The two species are separated by body size (144–172 vs.
84–125 mm
), the first dorsal pore (13/14 vs. 11/12) and last latero-esophageal heart (
12
vs.
13
). Differences between
Z. huastecus
sp. nov.
and other species of the genus are presented in Table 1.